Apply command-line overrides

OmegaConf.from_dotlist() parses key=value strings. It builds nested containers from dotted paths and parses values as YAML. Merge the resulting config after your defaults so it wins on conflicts:

>>> from omegaconf import OmegaConf
>>> defaults = OmegaConf.create({
...     "server": {"port": 80},
...     "debug": False,
... })
>>> overrides = OmegaConf.from_dotlist(["server.port=8080", "debug=true"])
>>> cfg = OmegaConf.merge(defaults, overrides)
>>> cfg.server.port, cfg.debug
(8080, True)

OmegaConf.from_cli() reads the same format from the command-line arguments in sys.argv[1:]. Call it without arguments in an application that receives OmegaConf overrides directly. An argument parser may collect the strings and pass them to from_dotlist() instead.

In 2.4, backslash-escape a literal dot, bracket, or equals sign in a key path. For example, r"a\.b=10" addresses the key a.b rather than nested keys a and b. Interpolation paths and OmegaConf.select() use the same key-path escaping rules.

When passing an override through a shell, quote it so the backslash reaches Python unchanged:

python app.py 'a\.b=10'